Bolt-anchor.



`Patented Dec. l0, I90I.

J. H. CK.

BOLT ANCHOR.

(Application med 'OBL 29, 190

No. 688,7I9.

(n m d l) H: Noms beren: co, PHQmLxwc.. smug-,10N n c elevation showing a bolt-anchor and bolt in- JOHN H. COOK, OF NEW YORK, N. Y.,

PaTnT Fries.

ASSIGN OR TO HENRY B. NEWHALL,

OF PLAINFIELD, NEW JERSEY.

BOLT-ANCHOR..

SPECIFICATION forming peut ef Lettere PatentNe. 688,719, aerea Deeember 1o, 1901. Appueetien ned oeater 29,1901. seein No. 80,615. (Ne meer To all whom t may concern.:

Be it known that I, JOHN H.' COOK, a citizen of the United States, and a resident of New York city, in the county of Kings and State of New York, have invented certain new and useful Improvements in Bolt- Anchors, of which the following isa specification, takenl in connection with the accompanying drawings, forming a part of the saine. y

This invention relates to bolt anchors formed of shields of metal which are inserted into a hole in masonry or other material and which are engaged by a bolt or screw and forced outward into firm contact with the material. In this way the bolt-anchor serves to firmly secure the bolt to the material in which the anchor is inserted.

,In the accompanying drawings, in which the same reference character refers to similar parts in the various views, Figure lis an serted therein. Fig. 2 is an elevation of one of the shields of which the bolt-anchor is composed, the bolt and the other shield being removed. Fig. 3 is a longitudinal section of the same, taken substantially along the bolt` hole. Fig. 4 is a transverse section of the bolt and shield, taken on the line 4 4e of Fig. 2. Fig. 5 is an` end view looking from the head of the shield, the bolt being removed. Fig. 6 is an elevation of another form of boltanchor, showing the bolt inserted. Fig. 7 is an elevation of one of the shields. Fig. 8 is a longitudinal section of the same along the bolt-hole. Fig. 9 is atransverse section showing the bolt and shields, taken on the line 9 9 of Fig. 7. Fig. l0 is a View in elevation of the head of the shields, the bolt being removed.

The bolt-anchor is formed of two similar shields A, preferably composed of hard material, such as iron. Each one of these shields is provided with the alining lug C at the head of the same, which is adapted to engage a corresponding alining groove C2, formed on the other shield. These lugs and grooves serve to keep the shield in proper relative position and prevent them from movinglongitudinally with respect to each other. In some cases,

however, it is not necessary to employ this means of holding the shields in proper relation. The shield A is formed with a threaded bolt-hole D, extending longitudinally of the? shield. At the front of the shield the bolthole, which extends equally into each of the shields, forms a complete circular hole symmetrical with the outside of the heads of the shields, as indicated in Fig. 5. The bolt-hole does not, however, extend to the same extent into the shields at their rear end. The bolt'- hole D' at this point is shallow, as indicated in Figs. 3 and 4, and, furthermore, the hole is not in the center of each shield. As is shown in Fig. 2, the portion A of the shield on the left of the hole is much greater than the porm tion on the other side of the hole.

As indicated, the bolt-hole is provided with the threads D2, which are engaged by the threads Bformed upon the bolt B of usual construction. This bolt, ,as indicated in Fig. l, is provided with the hexagonal head B, though it will be understood that any other form of bolt may be employed in connection with the shields shown'. Tapering ribs O may be formed, if desired, on the shields, so that when the shields are inserted into a hole they serve to grip the material to some extent as the shields are inserted and so hold the shieldsv in proper position as the bolt is driven in. Since, as is indicated, each of the shields is semicylindrical in form, the two shields may readily be inserted into a round hole. Then when they have been inserted and'when the bolt is screwed in the bolt engaging the threaded hole in the shields expands the rear of the shields, separating the two shields at this end. Furthermore, this causes the rear ends of the shields to slide one over the other,

so that the gripping-wings A are thrust into the material into which the shields are inserted and serves to rigidly grip the same, and, furthermore, these wings prevent thefrotation of the shield with the bolt. It will of course be understood that the amount of the separation between the shields at the'rear ends of the same and also the extent to which the gripping-wings are forced outward into the material may be varied by varying the position of the threaded bolt-hole in the shield. If desired, the threaded bolt-hole may beunsym'metrically placed at the head of the shields, as well as at the rear of the same. In this way the gripping-wings are thrust into the material at the head of the shield, as well as at the rear, or, if desired, throughout the whole length of the shield, if the threaded bolt-hole is unsymmetrically placed lthroughout the entire extent of the shield.

Instead of forming the bolt-anchor with two similar shields it might, if desired, be formed with any number of shields, which fit together to form a substantially cylindrical body when inserted into the'hole and which move upon one another to form gripping-wings when the bolt is inserted into the uns'ymmetricallyplaced hole in the shields. Furthermore, the shields, instead of being formed substantially cylindrical, as indicated, and with a plain outer surface, lmay be formed of any other desired shape, and the outer surface of the same may be provided with suitable projecltions or corrugations to engage the material .into which the shields are inserted in order to grip it more firmly.

and also, preferably, with the ribs C. TheseL shields are provided with the threaded bolt- It is possible to operate the shields without having them forced apart at the rear ends by the bolt. In order to accomplish this, I form a semicylindrical shield E, with the alining lugs C and the alining grooves C2, if desired,

hole F, which, as is indicated in Fig. 10, eX- tends equally into the shields at their head and forms a cylindrical hole symmetrical with the outer surface'of the shields. The threaded hole F, having the screw-threads F2, is unsymmetrically placed at the rear of the shields, so as to form the gripping-wings E. be noted, however, that at the rear of the shields the bolt-holes form a complete circular hole as large as the hole in the head of theshields.

When the shields E are inserted into a hole, the two semicylindrical. shields fit rigidly within a round hole. The bolt vB when inserted into the threaded bolt-hole engages by its screw-threads B2 the threads F? upon the' bolt-hole. This serves to slide the rear ends of the shields upon each other in opposite directions, so that the gripping-wings E are forced outward into engagement with the material in which the shields `are placed, as is indicated in Fig. 9. These wings have a dovetail action and, furthermore, prevent the rotation of the vshields with the bolt. The two shields are not, however, separated from each other by the action of the bolt, as is the case with the other form of shields which I described. It will be noted that in this instance also the threaded bolt-hole is symmetrically placed in the head of the shield and is unsymmetrically placed in the rear of the shield to form the gripping-wings when the bolt is inserted into the shield.

It will.

essaie Many modifications may be made from the exact disclosure which I have made in this case. Furthermore, parts of my invention maybe used without employing all of the same. I do not therefore wish to be limited by the disclosure which `I have made; but

What I claim as new, and what I wish to unsymmetrically placed in `the rear of thel shields to form oppositely-projecting gripping-wings whenv abolt is inserted into the said bolt-hole.

2. A bolt-anchor comprising two'substantiallysemicylindrical shields, said shields being formed with a threaded bolt-hole symmetrically placed at the head of said shields and unsymmetrically placed at the rear of said shields to form oppositely-projecting gripping-wings when a bolt is inserted into said hole, said bolt-hole being shallower at the rear of said shields than at the head of the same.

3. A bolt-anchor comprising two similar semicylindrical shields, said shields being formed with a threaded bolt-.hole extending longitudinally of said shields and unsymmetrically placed at the rear of said shields'to form oppositely-projecting gripping-wings at the rear of said shields when the bolt is in:

serted into saidhole, said bolt-hole being shallower at the rear of said shields than at the head of the same. f

4. A bolt-anchor comprising two similar substantially semicylindrical shields,- said shields being formed with a longitudinal threaded bolt-hole symmetrically placed at the head of said shields and unsymmetrically placed at the rear of said shields to formgrip= ping-wings at the rear of said shields when a bolt is inserted into said bolt-hole.

5. A bolt-anchor comprising two shields,- said shields being formed with a threaded bolt-hole extending longitudinally of the same, said bolt-hole being unsymmetrically placed at the rear of said shields to form gripping-wings at the rear of said shields when a boltl is inserted into said bolt-hole.y

6. A bolt-anchor comprising two substantially semicylindrical shields, said shields being formed with a threaded bolt-hole unsymmetrically placed at the rear of said shields to cause said shields to slide when a bolt is inserted into said bolt-hole and to form oppositely-projecting gripping-wings at the rear of said shields.

7. A bolt-anchor comprising two shields, said shields being formed with a threaded bolt-hole unsymmetrically placed in said 'shields to cerise said shields to slide u'pon each inserted into said shields to forni utwardly other` when a bolt is inserted into said shields proj eating gripping-Wings. o to form oppostely-projecting gripping-Wings.

8. A bolt-anchor comprising shields, said JOHN H' COOK 5 shields being formed with a, threaded bolL- Witnessesi hole unsymmetreally placed in said shields HARRY L. DUNCAN,

to cause said shields to slide when a bolt is JOHN N. MOORE. 

